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Typically the 100uF makes the bottom pull up and inhibits correct linearity...Which may have morphed into what you have with control adjustments to try and correct for it...
Also, bear in mind that if there is less or more horizontal overscan than vertical overscan then it will not be round even if the vertical is working perfectly and perfectly linear. Zeniths have a copper width sleave that you can slip between the yoke and CRT neck...It will affect both axes some but has a MUCH greater effect on the horizontal. Once the vert is perfectly linear increase horizontal overscan using the sleave until circles are round.
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